A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Tools available to ♦ moderators. If your question is about the "access to moderator tools" privilege (granted at 10k rep on graduated sites, 2k on beta sites), use [10k-tools] instead. PLEASE REDACT S…
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the governing meta site for all Stack Exchange sites together. Use this tag to ask questions about this very site, a.k.a. MSE. In some sense, the [meta] tag is Meta-Meta Stack Exchange.
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For questions about the functionalities, queries, databases and datamodel of The Stack Exchange Data Explorer (SEDE). SEDE allows you to create and run queries against copies of the databases of popul…
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Use along with [meta] to ask about specific questions here on Meta Stack Exchange. Questions about questions on other network sites are off-topic here and should be posted on the site's meta instead.
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General questions about questions that have been closed because they are off-topic or otherwise do not meet the criteria defined in the FAQ.
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Questions about the various user interface and email elements used to notify users of events on the site.
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for questions or issues surrounding login to this site.
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the process of migrating off-topic questions from a Stack Exchange site to another.
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the answer the question owner thought best met their needs. This tag is for discussing issues related to accepted answers, not indicating that a question has an accepted answer.
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for questions specifically about the process of asking questions on a Stack Exchange site.
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Refers to user accounts either generically, or across the network.
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refers to all questions deleted from Stack Exchange sites. You can also use this tag along with [specific-question] and [meta] to ask why a specific question on Meta Stack Exchange was delete…
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For questions about the mobile versions of Stack Exchange sites. For questions about the mobile apps, use the [android-app] and the [ios-app] tags as needed. Since the new responsive design will event…
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those users who may be new to the Stack Exchange Q&A format, and generally have a low reputation score, which starts from 1 at the time of registration.
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abilities you earn with increased reputation to do and see more on the site. Use this tag for questions about privilege levels and privilege notifications.
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for questions about tag synonyms (how they work, who can create them, etc). To request a tag synonym, ask on the per-site meta with the tag [synonym-request].
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for instructions and guidance on closing or migrating questions, and the reasons for those closures.
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the tag to use for any questions related to deleted answers specifically.
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for requests to replace one tag with another existing tag. It also applies to requests that one tag should be merged into another, or simply abandoned.
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Indicates that the site developers were not able to replicate the behavior reported.
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the norms and standards of accepted behavior and politeness in our community. The golden rule is "Think before you post."
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The black bar across the top of every Stack Exchange site.
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for questions dealing with moderator actions, pages, abilities or decisions.
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For questions about the images used on Stack Exchange sites or about using images in your own posts.
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for questions about suspected user spam, the spam flag or combating spam as a community.
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OpenID was previously the main login flow for Stack Exchange; it has since been deprecated.
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For questions about making code appear correctly in questions, answers and comments.
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an editable page that briefly summarizes the topic of the tag and that may provide links to existing questions that are often useful to many people.
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Questions about diamond (♦) moderators, their powers, and actions they have taken.
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a flag that can be applied to answers (and sometimes questions) which lowers the barrier for editing and prevents any rep gain/loss from voting.
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designed to help new reviewers hone their moderation skills, while nudging more experienced users that don't seem to be paying close attention to what they're revi…
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for questions regarding off topic questions, including whether a question is on topic and what to do with off topic questions. DO NOT use this tag to post questions you know to be off-topi…
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for questions specific to upvotes, the community's way of telling peers that their content was clear and helpful. Up-votes on the meta sites may have different meanings.
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for general questions about users and user accounts.
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Anything related to posts of low quality, such as flagging posts for "very low quality", or the low quality posts review task.
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Questions about the meta site that every Stack Exchange site has (also called 'child metas').